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h+(h+90)=100
We move all terms to the left:
h+(h+90)-(100)=0
We get rid of parentheses
h+h+90-100=0
We add all the numbers together, and all the variables
2h-10=0
We move all terms containing h to the left, all other terms to the right
2h=10
h=10/2
h=5
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